Keystones — Capstone
Five GCSE retrieval questions · 23 November 2016 · mathsvault.uk/keystones
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1. Number Simplifying surds
Simplify: 5√96
Answer: 20√6 -
2. Algebra Completing the square
Complete the square: 5x² + 10x + 7
Answer: 5(x + 1)² + 2 -
3. Geometry Area using ½ab sin C
Find area of triangle: a = 21cm, b = 25cm, angle = 75°. Give your answer to 2 decimal places
Answer: 253.56cm² -
4. Ratio Combining two ratios
a:b is 7:5 and b:c is 8:7. Find a:b:c in its simplest form.
Answer: 56:40:35 -
5. Statistics Averages and range
Find the mean, median and range of: 50, 91, 21, 20, 61, 32, 14. Give your answer to 2 decimal places
Answer: Mean = 41.29, Median = 32, Range = 77